linux-kernel - Re: [RFC][PATCH 1/7] lockdep: Fix combinatorial explosion in lock subgraph traversal.

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Message-Id: <20080805.013445.30774221.davem@davemloft.net>
Date:	Tue, 05 Aug 2008 01:34:45 -0700 (PDT)
From:	David Miller <davem@...emloft.net>
To:	a.p.zijlstra@...llo.nl
Cc:	torvalds@...ux-foundation.org, jeremy@...p.org, hugh@...itas.com,
	mingo@...e.hu, akpm@...ux-foundation.org,
	linux-kernel@...r.kernel.org, davej@...hat.com
Subject: Re: [RFC][PATCH 1/7] lockdep: Fix combinatorial explosion in lock
 subgraph traversal.

From: Peter Zijlstra <a.p.zijlstra@...llo.nl>
Date: Mon, 04 Aug 2008 15:03:18 +0200

> When we traverse the graph, either forwards or backwards, we
> are interested in whether a certain property exists somewhere
> in a node reachable in the graph.
 ...
> Signed-off-by: David S. Miller <davem@...emloft.net>
> Signed-off-by: Peter Zijlstra <a.p.zijlstra@...llo.nl>

Peter, when Ingo added this to his tree he needed to add a build
fix of some sort.  Did you include that here?

I think the problem was that if CONFIG_PROVE_LOCKING is not
set, we need to add nop inline versions of lockdep_count_*_deps()
in kernel/lockdep_internals.h

See:

http://marc.info/?l=linux-kernel&m=121758260130275&w=2





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